Fontsy

With the release of Bitsy 5 came a brand-new font system. The new system is far more customizable than the old one: among other features, it includes a spec for a .bitsyfont format which can be used to make custom fonts.

Since the format is plaintext, it's relatively easy to make custom fonts by typing them out in a text editor, but from a creative perspective, it's a bit hard to draw characters that way. To help with this, Fontsy provides a way to convert back-and-forth between .bitsyfont and .bitsyfont.png files, which can be used to draw fonts in a more traditional image editor.

Notes:

The default bitsy font is imported by default

Fontsy doesn't save anything; make sure to export your work!

Font data is 1-bit (i.e. black and white)

The images used for the old custom font hack are not compatible with Fontsy

If you're using the built-in editor, keep the export section closed to improve performance

Hover over characters in built-in editor to see code points

Recommended workflow:

Pick an existing font to use as a base (e.g. the default bitsy font, or one of the others included in the bitsy editor)

Import .bitsyfont file

If needed, make minor edits using the built-in editor (e.g. changing size, name, or adding characters)

Export .bitsyfont.png image

Open image in external editor and customize font (note: make sure not to edit the borders, and to export in a mode which doesn't affect colours)